Right behind, huge red arms will rotate to install huge slabs of concrete to create the actual tunnel-while massive, black pistons will push those slabs tightly together- at the same pushing Bertha's cutter head forward.

All the rock, sand and dirt will flow through the many cutter heads, then through massive middle and rear sections.

The rock, sand and dirt will be loaded onto conveyor belts before its loaded onto barges and taken away.

The whole process is extremely slow--Bertha will average just 30 feet per day,

But there shouldn't be traffic delays.

The next road change is coming in 2014 - when they shift lanes of State Route 99 near Century Link a tad bit north, said Matt Preedy with WSDOT.

"It will look a little different, but the number of lanes you'll have and the ramp locations are going to be the same," he said.

After Bertha starts digging in July, she'll keep digging for a little more than a year.

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